JP2002237241A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a coil conductor from being ruptured, and cope with a requirement to cut down solder, by simplifying the winding work of an electromagnet while coping with restriction for the outline dimension of an electromagnetic relay. SOLUTION: This electromagnetic relay 10 is equipped with the electromagnet 14 assembled in a base part 12. Each of a pair of coil terminals 26, 28 installed in the electromagnet 14 is integrally equipped with a termination part 26a, 28a linearly extending in one end area and a wire end adhering part 26b, 28b linearly extending in the almost perpendicular direction to the termination part 26a, 28a in other end area. Both coil terminals 26, 28 are fixed to a terminal supporting part 20 with each termination part 26a, 28b disposed almost perpendicularly to the central axis of a coil and protruded from the terminal supporting part 20d of a winding frame 20, and with each wire end adhering part 26b, 28b disposed almost side by side with the central axis of the coil and protruded toward the outside of a coil 22 from the terminal supporting part 20d in the central axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art Generally, an electromagnet mounted on an electromagnetic relay is formed by winding a conductor around a body of an electrically insulating bobbin that receives an iron core to form a coil, and connecting both ends of the conductor to the bobbin. And is connected to a pair of coil terminals installed in each of them. In this type of electromagnetic relay, a pair of coil terminals of an electromagnet are arranged side by side in a direction substantially parallel to the central axis of the coil, and a movable contact plate and a fixed contact plate forming an on-off contact portion near the electromagnet But,
As those coil terminals, those arranged side by side in the coil axis direction are known (for example, JP-A-2000-18).
No. 2496). According to this configuration, the outer dimensions of the electromagnetic relay, particularly the width direction crossing the coil axis, can be effectively reduced, so that the so-called thickness reduction can be promoted.

In such a thin electromagnetic relay, when a coil is formed by winding a conductive wire around the body of a bobbin, a wire end fixing portion provided at one end of a pair of coil terminals installed on the bobbin is provided. The winding operation is carried out in advance by arranging the wire end of the conductor wire at a position where the wire end is easily entangled, that is, at a position (hereinafter referred to as an operation position) protruding outward in the transverse direction with respect to the longitudinal axis of the body portion of the bobbin. . In the winding operation, one wire end of the conductor is entangled and temporarily held at the wire end fixing portion of the one coil terminal arranged at the work position, and then the required length of the conductor is wound around the bobbin trunk. To form a coil. Thereafter, the other wire end of the conductive wire is entangled with the wire end fixing portion of the other coil terminal arranged in the working position and temporarily held, and further, each wire end is fixed to the corresponding wire end fixing portion by soldering or welding. . Finally, each coil terminal is bent and deformed, and the wire end fixing portion is moved from the working position.
It is displaced to an assembly completed position that extends along the side surface of the coil and does not substantially protrude outside the bobbin. According to such a procedure, it is possible to perform the winding operation quickly and accurately while complying with the restrictions on the outer dimensions of the electromagnetic relay, particularly the width direction dimensions.

In the above-mentioned conventional thin electromagnetic relay, a yoke forming a magnetic path around the coil is fixedly connected to one end of an iron core received by the bobbin in the axial direction, and is also connected to a leaf spring. An armature, which is connected to the yoke so as to be elastically movable relative to the yoke, is disposed so as to face the other axial end of the iron core to form a magnetic circuit assembly. The magnetic circuit assembly is fixedly mounted on an electrically insulating base supporting the movable contact plate and the fixed contact plate. At this time, conventionally, a protrusion is provided at a predetermined position on the base, a groove capable of press-fitting the protrusion is provided on a yoke of the magnetic circuit assembly, and the yoke is mounted on the base by press-fitting so that the magnetic circuit assembly is mounted on the base. Is adopted.

[0005]

As described above, in the conventional thin electromagnetic relay, at the time of winding work, after the wire ends are fixed to the wire end fixing portions of the respective coil terminals, the wire end fixing portions are moved to the working position. However, this operation requires an increase in the number of manufacturing steps of the electromagnetic relay and the skill of the operator, and as a result, there is a concern that the manufacturing cost is increased. In particular, when the wire end fixing portion is displaced from the working position to the assembly completed position, depending on the direction of the displacement, excessive tensile stress is applied to the extension of the conductor extending between the coil and the wire end fixing portion of each coil terminal. Addition or loosening may occur. Such excessive tensile stress or looseness can be a factor that causes breakage of the conductor. Also, when the wire ends are fixed to the wire end fixing portions of the respective coil terminals by arc welding, it tends to be difficult to displace the wire end fixing portions to the assembly completion position after the fixing. For this reason, soldering is usually employed for the fixing work, but it is desired to meet the demand for solder reduction from the viewpoint of environmental protection.

On the other hand, in a conventional thin electromagnetic relay, in which the magnetic circuit assembly is fixed to the base by press-fitting a projection on the base into a groove provided in the yoke, the cross-sectional area of the yoke is limited to the area of the groove. Since the magnetic flux decreases, the magnetic path becomes narrow and the magnetic flux decreases. As a result, the magnetic attraction force of the electromagnet decreases, and the opening and closing operation tends to be unstable. To address this issue,
When the yoke groove and the protrusion of the base pressed into it are made smaller, the mounting strength of the magnetic circuit assembly with respect to the base is reduced,
There is a concern that the structural reliability of the electromagnetic relay will decrease.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay in which a pair of coil terminals are arranged side by side in a direction substantially parallel to the center axis of a coil, while meeting the restrictions on external dimensions, especially width dimensions, and An electromagnetic relay that simplifies the winding operation of the coil, eliminates the danger of breakage that may occur in the extension of the conductor between the coil and each coil terminal as much as possible, and can meet the demand for solder reduction in the manufacturing process. To provide.

Another object of the present invention is to provide an electromagnetic relay in which a yoke connected to an electromagnet is press-fitted to a base without reducing a cross-sectional area of a yoke constituting a magnetic path. It is an object of the present invention to provide an electromagnetic relay capable of securely fixing a base to a base portion, thereby ensuring stable operation characteristics and high structural reliability.

[0009]

In order to achieve the above object, the invention according to claim 1 comprises a coil supported on a bobbin and a conductive wire installed on the bobbin and forming the coil. A pair of coil terminals each having a wire end connected thereto, wherein the pair of coil terminals are arranged side by side in a direction substantially parallel to a central axis of the coil; Each has a terminal portion extending in a direction intersecting the center axis of the coil and protruding outward from the bobbin, and a terminal portion extending in a direction intersecting the terminal portion and having a substantially axis line with respect to the coil from the bobbin. And a wire end fixing portion that protrudes outward in the direction and is fixed to each of the wire ends of the conductive wire.

According to a second aspect of the present invention, in the electromagnetic relay according to the first aspect, each of the pair of coil terminals includes a fixing portion extending between the terminal portion and the wire end fixing portion, An electromagnetic relay is provided in which the fixing portion is tightly surrounded by the material of the bobbin and integrally fixed by an insert molding process.

[0011] The invention according to claim 3 is the invention according to claim 1 or 2.
In the electromagnetic relay described in the above, an iron core received by the bobbin along the central axis of the coil, a yoke connected to the iron core, forming a magnetic path around the coil, and the yoke A base for supporting the iron core through the base, wherein the yoke has a protrusion fixed to the base by press-fitting.

According to a fourth aspect of the present invention, there is provided a coil supported by a bobbin, an iron core received by the bobbin along a central axis of the coil, and a coil connected to the iron core and having a periphery of the coil. In an electromagnetic relay including a yoke forming a magnetic path and a base supporting the iron core through the yoke, the yoke has a protrusion fixed to the base by press-fitting. An electromagnetic relay is provided.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the drawings, the same or similar components are denoted by common reference numerals. Referring to the drawings, FIGS. 1 and 2 show an electromagnetic relay 10 according to an embodiment of the present invention from different directions. As shown in the drawing, the electromagnetic relay 10 includes a base 12, an electromagnet 14 incorporated in the base 12, an armature 16 driven by the electromagnet 14, and a contact 18 that opens and closes with the movement of the armature 16. It is configured with. The base 12 is made of an electrically insulating resin molded article. A magnetic circuit assembly described later is mounted on the base 12, and a contact portion 18 is supported by the base 12 near the magnetic circuit assembly.

As shown in FIG. 3, the electromagnet 14 is
0, a coil 22 supported on the bobbin 20, and a coil 22
Core 2 supported by the bobbin 20 along the central axis 22a of the
4 is provided. The winding frame 20 is an electrically insulating resin molded product, and as shown in FIGS. 4 and 5, a body 20a linearly extending to a predetermined length while having a U-shaped cross section, 2
0a, a pair of C-shaped flanges 2 connected to both ends in the longitudinal direction
0b, 20c and a terminal support 20d extending from one flange 20b in a direction intersecting the longitudinal axis of the body 20a.
And a bottom plate portion 20e which extends substantially perpendicularly to the terminal support portion 20d and below the flange portion 20b. Reel 20
A pair of coil terminals 26 and 28 made of a good electrical conductor are fixedly arranged in a direction substantially parallel to the longitudinal axis of the body 20a, that is, the central axis 22a of the coil 22, in the terminal support portion 20d. Mounted.

The coil 22 is formed by tightly winding a required length portion of a conductive wire around the trunk 20a of the bobbin 20, and is fixedly held between both flange portions 20b and 20c of the bobbin 20. . The conducting wire 30 forming the coil 22 is provided at both ends thereof with a bobbin 20.
A pair of coil terminals 2 installed on the terminal support 20d
6 and 28 (see FIG. 3).

The iron core 24 is, for example, a columnar member formed by punching a predetermined shape from a magnetic steel plate, and most of the iron core 24 is fixedly received inside the body 20a of the bobbin 20 having a U-shaped cross section. You. As shown in FIG. 3, a head 24 a having a flat end surface is provided at one end in the axial direction of the iron core 24, and the head 24 a is arranged so as to be exposed outside the flange 20 b of the bobbin 20. The leg 24b at the other end in the axial direction of the iron core 24 projects outward from the other flange 20c of the bobbin 20.

To the iron core 24 of the electromagnet 14, a yoke 32 forming a magnetic path around the coil 22 is fixedly connected to the leg 24b at the other end in the axial direction, for example, by caulking (see FIG. 6). ). The yoke 32 is, for example, a plate-shaped member that is punched out of a magnetic steel plate into a predetermined shape and is bent in an L-shape. A short portion of the yoke 32 extends along the flange 20 c of the bobbin 20 and has a long length. The measuring portion is spaced apart from the side of the coil 22 and extends substantially parallel to the coil center axis 22a. Yoke 3
The free end 32a of the long part of the second 2
The armature 16 is swingably connected to the free end 32a.

The armature 16 is, for example, a plate-shaped member formed by punching a predetermined shape from a magnetic steel plate. The armature 16 is connected to a yoke 32 via an L-shaped leaf spring 34 so as to be elastically movable relative to each other. , And are arranged facing the head 24a of the iron core 24 (see FIG. 2). The leaf spring 34 functions as a hinge between the yoke 32 and the armature 16, and urges the armature 16 in a direction away from the head 24 a of the iron core 24 by its own spring action. In this manner, the core 24, the yoke 32, and the armature 16 of the electromagnet 14 combined in association with each other form a magnetic circuit assembly that forms a magnetic circuit when the electromagnet 14 operates.

When the electromagnet 14 is not operated, one end (the lower end in the figure) 16a of the armature 16 is brought into contact with the free end 32a of the yoke 32 under the spring force of the leaf spring 34, so that the armature 16 24 is held stationary at a recovery position (see FIG. 1) separated from the head 24a by a predetermined distance. When the electromagnet 14 operates, the armature 16 is moved by its magnetic attraction to the lower end 1 thereof.
It swings around the engagement portion between the free end portion 6a and the yoke free end portion 32a in a direction approaching the iron core head 24a against the spring force of the leaf spring.

The base 12 includes a first portion 36 for installing the electromagnet 14 and the magnetic circuit assembly, and a second portion 38 for installing the contact portion 18 (see FIGS. 1, 2 and 7). The contact portion 18 includes a pair of fixed contact plates 40, 4 arranged side by side at predetermined intervals in the direction of the axis of the coil of the electromagnet 14.
2 and a movable contact plate 44 arranged at a predetermined interval between the fixed contact plates 40 and 42.
The fixed contact plates 40 and 42 are, for example, conductive plate members formed by punching a predetermined shape from a copper plate. The movable contact plate 44 is a conductive plate member formed by stamping out a thin plate of phosphor bronze for spring into a predetermined shape. In addition, the first portion 36 and the second portion 38 of the base 12 correspond to the electromagnet 14, the magnetic circuit assembly, the fixed contact plates 40 and 42, and the movable contact plate 44.
Are separated by insulating walls 52, 54 formed integrally with the base 12 to secure an insulating distance between the base 12 and the base 12.

Fixed contact plates 40 and 42 and movable contact plate 44
Are fixedly attached to the second part 38 of the base 12 at respective longitudinal intermediate regions, and fixed contact 46, 48 and movable movable opposing contactable respective free end regions protruding above the base 12. The contact 50 bulges.
The other end area of each of the fixed contact plates 40 and 42 and the movable contact plate 44 projects below the base 12 and
a, 42a and 44a are formed. Those terminal portions 40
a, 42a, and 44a are the coil center axis 2 of the electromagnet 14.
2a (FIG. 3). In the illustrated embodiment, the fixed contact plate 4 closer to the electromagnet 14 is
0 constitutes a break contact, and the fixed contact plate 42 remote from the electromagnet 14 constitutes a make contact.

The movable contact plate 44 is connected to the armature 16 via an electrically insulating connecting member 56. Connecting member 56
Is composed of, for example, a long plate integrally formed of a resin material, and is connected at one longitudinal end 56a thereof to a free end (upper end in the figure) portion 16b of the armature 16 remote from the yoke 32, and The other end 56b is connected to the free end (the upper end in the figure) of the movable contact plate 44 on the side remote from the base 12. The connecting member 56 is provided with the armature 1 associated with the excitation / de-excitation of the electromagnet 14.
6, the reciprocating operation is performed in a direction substantially parallel to the coil center axis 22a (FIG. 3), whereby the oscillating operation of the armature 16 is transmitted to the movable contact plate 44 as follows. I do.

In the rest position shown in FIG. 1, the armature 16 is moved under the force of the leaf spring 34 under the force of the iron core 24, as described above.
Is separated from the head 24a by a predetermined distance. At this time, the connecting member 56 is located at one end of the reciprocating range, so that the movable contact plate 44 connected to the other end 56 b is elastically moved so as to approach the fixed contact plate 40 closer to the electromagnet 14. Flexed. And in this state,
The movable contact 50 and the fixed contact 46 are brought into conductive contact, and the break contact is closed.

When the electromagnet 14 is operated from the recovery position shown in FIG. 1, the armature 16 is moved by its magnetic attraction to the lower end 16 thereof.
swings in a direction approaching the iron core head 24a against the spring force of the leaf spring 34 around the engagement portion between the a and the yoke free end 32a. Accordingly, the connecting member 56 moves toward the other limit of the reciprocating movement range, and resiliently bends the movable contact plate 44 so as to approach the fixed contact plate 42 remote from the electromagnet 14. When the armature 16 is attracted to the iron core head 24a, the connecting member 56 reaches the other end of the reciprocating range, the movable contact 50 comes into conductive contact with the fixed contact 48, and the make contact is closed.

The electromagnetic relay 10 having the above-described structure can effectively reduce the outer dimensions, particularly the width in the direction intersecting the coil center axis 22a. Such a thin electromagnetic relay 10 employs the following characteristic configuration for simplifying the winding operation and eliminating as much as possible the risk of breakage of the coil conductor within the required dimensional restrictions. I have.

As shown in FIG. 8, each of a pair of coil terminals 26, 28 installed on the electromagnet 14 has terminals 26a, 28a extending linearly at one end region and terminals 26a, 28a at the other end region. Line end fixing portions 26b, 28b extending linearly in a direction substantially perpendicular to the front end, and fixed portions 26c, 28c extending in a crank shape between the terminal portions 26a, 28a and the line end fixing portions 26b, 28b. Prepare together. These coil terminals 26 and 28 are formed by punching, for example, from a copper plate into a predetermined shape having substantially the same thickness and different length. More specifically, the coil terminal 26 has a fixing portion 26c longer than the fixing portion 28c of the coil terminal 28, and the extension direction of the wire end fixing portion 26b as viewed from the terminal portion 26a corresponds to the terminal portion of the coil terminal 28. The direction of extension of the wire end fixing portion 28b as viewed from the line 28a is opposite to the extending direction.

Both coil terminals 26, 28 having the above-described configuration
As shown in FIGS. 3 and 9, each terminal unit 26a,
28a are arranged in a direction substantially perpendicular to the center axis 22a of the coil 22 so as to protrude downward from the terminal support portion 20d of the bobbin 20, and to secure each wire end fixing portion 26b, 28b
Are fixed substantially parallel to the coil center axis 22a and protrude outward from the terminal support 20d in the same center axis direction with respect to the coil 22 from the terminal support 20d.

Here, when there is a dimensional restriction on the terminal supporting portion 20d of the winding frame 20, the insert molding process is performed.
It is advantageous to fix both coil terminals 26, 28 integrally to the terminal support 20d. In this case, both coil terminals 26 and 28 are provided at predetermined positions in a mold (not shown) of the bobbin 20.
Are arranged as inserts, and the winding frame 20 is integrally formed, so that the fixing portions 26c of the coil terminals 26 and 28,
28c is integrally fixed to the terminal support 20d in a state of being tightly surrounded by the material of the bobbin 20. Thus, the winding frame 20 with coil terminals as shown in FIGS. 4 and 5 is provided.

With both coil terminals 26, 28 properly mounted on the terminal support 20d of the bobbin 20, the ends 26a, 28a of the coil terminals 26, 28 are oriented in a direction substantially parallel to the coil center axis 22a. Are arranged at predetermined intervals from each other. On the other hand, wire end fixing portions 26b and 28b
Are arranged at predetermined intervals in a direction substantially perpendicular to the coil center axis 22a. Then, the lead wire 30 forming the coil 22 is attached to the wire end fixing portions 26b, 28b of the coil terminals 26, 28 arranged in advance in this manner.
The end of each line in FIG. 10 is fixed.

Next, a winding operation for forming the coil 22 on the winding frame 20 of the electromagnet 14 will be described with reference to FIG. As described above, the wire end fixing portions 2 of the coil terminals 26 and 28
6b and 28b are arranged to protrude from the terminal support portion 20d of the bobbin 20 in advance in the center axis direction with respect to the coil 22 to be formed, that is, outwardly in the longitudinal axis direction with respect to the body portion 20a of the bobbin 20 ( (Fig. 4). Such an arrangement of the wire end fixing portions 26b and 28b does not hinder the prompt and accurate winding of the conductive wire 30 around the trunk 20a of the bobbin 20.

First, one end of the conductive wire 30 is entangled with the wire end fixing portion 26b of the coil terminal 26 arranged on the upper side in the figure and temporarily held. The coil 22 is wound around the body 20a. At this time, the extension 30a on the winding start side of the conductive wire 30 extending between the coil 22 and the wire end fixing portion 26b is received in the groove 58 formed on the side surface of the terminal supporting portion 20d of the winding frame 20.

When the formation of the coil 22 is completed, the conductor 30
To the other end of the coil terminal 28 arranged on the lower side in the figure.
Is temporarily entangled with the wire end fixing portion 28b. At this time,
Conducting wire 30 extending between coil 22 and wire end fixing portion 28b
The end portion 30b on the winding end side is received in the groove 60 formed on the side surface of the terminal supporting portion 20d independently of the groove 58. The relative positional relationship between the winding start and the winding end of the conductive wire 30 is for avoiding the cross contact between the extended portions 30a and 30b of the conductive wire 30, and during the operation of the electromagnet 14, the extended portions 30a, This has the effect of suppressing the heat generated in 30b.

Finally, each wire end of the conductive wire 30 temporarily held by the wire end fixing portions 26b, 28b of the coil terminals 26, 28 is fixed to the corresponding wire end fixing portions 26b, 28b by soldering or arc welding. . In the state where the connection of the conductive wire 30 is completed in this way, the two coil terminals 26 and 28 that are arranged to protrude outward with respect to the coil 22 in the central axis direction.
Since the wire end fixing portions 26b and 28b are located at positions where they do not project outward particularly in the width direction of the bobbin 20, there is no need to bend and displace in any direction, and they are left as they are.

As described above, the electromagnetic relay 10 according to the present invention
According to this, in the winding operation of the electromagnet 14, the wire end fixing portions 26 of the respective coil terminals 26, 28 to which the conductor wire ends are fixed.
Since the wires b and 28b are not bent and displaced after the completion of the fixing, the winding operation can be simplified, and the risk of breakage that may occur in the wire extension portions 30a and 30b between the coil 22 and the coil terminals 26 and 28 is possible. Can be eliminated as much as possible. At this time,
The wire end fixing portions 26b and 28b of the coil terminals 26 and 28 to which the conductor wire ends are fixed are located at positions where they do not protrude to the outside in the width direction of the winding frame 20 in particular, so that the electromagnetic relay 10 responds to the restriction of the dimension in the width direction in particular. it can. In addition, since the arc welding can be effectively applied when fixing the ends of the conductor wires to the wire end fixing portions 26b, 28b, it is possible to meet the demand for solder reduction in the manufacturing process. Therefore, the electromagnetic relay 10 can be manufactured inexpensively and ecologically while promoting thinning, and has excellent operation reliability.

In the above configuration, the pair of coil terminals 26, 28 are properly mounted on the terminal support portion 20d of the bobbin 20, and the respective wire end fixing portions 26b, 28b are positioned outside the coil axial direction. Terminal 2 of coil terminal 28
It is desirable to have a size and a shape that do not protrude outward in the coil axial direction than 8a. According to such a configuration, the electromagnetic relay 10 can cope not only with the dimension in the width direction but also with the dimensional restriction in the coil axis direction, so that the size can be further reduced.

The electromagnetic relay 10 having the above configuration employs a configuration in which the yoke 32 connected to the electromagnet 14 is press-fitted to the base 12 to fix the electromagnet 14 and the magnetic circuit assembly to the base 12. I have. Such a configuration is effective for promoting a reduction in the thickness of the electromagnetic relay 10, and in particular, in the electromagnetic relay 10, the magnetic attraction force of the electromagnet 14 is reduced while securing the attachment strength of the yoke 32 to the base 12. In order to eliminate as much as possible, the following characteristic configuration is adopted.

As shown in FIG. 11A, the yoke 32 is
In a substantially central region of the long portion 32b, there is provided a pair of protrusions 62 protruding in a direction opposite to the short portion 32c. The projections 62 have a substantially columnar shape, and are arranged apart from each other by a predetermined distance in the longitudinal direction of the elongated portion 32b. Also, as shown in FIG. 11B, a long portion 32b of the yoke 32
Alternatively, a pair of cylindrical recesses 64 may be formed at positions corresponding to the two projections 62 on the same side as the short portion 32c.

On the other hand, as shown in FIG.
In the portion 36, a bottom wall 66 extending in the horizontal direction substantially perpendicular to the insulating wall 52 on the side surface and a pressing wall 68 extending in the same horizontal direction above the bottom wall 66 are provided at predetermined intervals. A pair of grooves 70 are formed in the bottom wall 66 on the side facing the holding wall 68. The grooves 70 extend linearly in a direction substantially perpendicular to the insulating wall 52, and each have a dimension capable of slidably receiving the projection 62 of the yoke 32. Double groove 70
A pair of protruding ridges 72 extending straight in a direction substantially orthogonal to the insulating wall 52 is provided between them.

The distance between the bottom wall 66 and the holding wall 68 of the base 12 corresponds to the thickness of the long portion 32b of the yoke 32. Accordingly, the yoke 32 is stably sandwiched between the bottom wall 66 and the holding wall 68 of the base 12 with the long portion 32b being received substantially without play. The distance between the outer surfaces of the pair of protrusions 72 provided on the bottom wall 66 corresponds to the distance between the pair of protrusions 62 provided on the yoke 32. In particular, the pair of projections 72 of the bottom wall 66 have a size and shape that are clamped under pressure between the projections 62 of the yoke 32.

The electromagnet 14 and the magnetic circuit assembly are
At the time of assembling, the long portion 32b of the yoke 32 connected to the electromagnet 14 is inserted between the bottom wall 66 and the holding wall 68 from the side of the base 12, and the pair of yoke 32 The projections 62 are respectively inserted into the pair of grooves 70 of the base bottom wall 66 from the side. Accordingly, a pair of protrusions 72 of the base bottom wall 66 are press-fitted between the two protrusions 62 of the yoke 32. When the electromagnet 14 and the magnetic circuit assembly are further pushed toward the insulating wall 52 on the base side, the protrusions 62 of the yoke 32
Is guided along the two ridges 72 of the bottom wall 66, and the electromagnet 1
4 and the magnetic circuit assembly are assembled in position on the first portion 36 of the base 12. In this state, the long portion 32b of the yoke 32 is press-fitted between the bottom wall 66 and the holding wall 68 of the base 12, whereby the electromagnet 14 and the magnetic circuit assembly are firmly fixed to the base 12. Is held.

In the above configuration, by providing the press-fitting projections 62 on the yoke 32 forming the magnetic path, a portion where the cross-sectional area of the yoke 32 is locally reduced is eliminated, and therefore, the magnetic flux is reduced. As a result, the magnetic attraction of the electromagnet 14 is prevented from being reduced. The mounting strength of the electromagnet 14 and the magnetic circuit assembly with respect to the base 12 is maintained by ensuring sufficient dimensions of the projections 62 and the ridges 72. Therefore, the electromagnetic relay 10 has stable operation characteristics and high structural reliability. In addition, such a yoke press-fitting structure can be applied to other electromagnetic relays that do not have the characteristic coil terminal structure described above.

The electromagnet 14 and the magnetic circuit assembly are
When properly assembled to the bottom plate 2 of the bobbin 20 of the electromagnet 14,
Oe and the bottom wall 66 of the first portion 36 of the base 12 engage at their outer edges to define a substantially flat bottom surface of the electromagnetic relay 10. Thereby, the terminal portions 26a and 28a of the pair of coil terminals 26 and 28 in the electromagnet 14 and the terminal portions 40a, 42a and 44a of the fixed contact plates 40 and 42 and the movable contact plate 44 in the contact portion 18 are in the coil axial direction. Are arranged in a straight line (see FIGS. 1 and 2). Such a configuration promotes a reduction in the thickness of the electromagnetic relay 10. A rectangular box-shaped case (not shown) is placed over the electromagnetic relay 10 and connected to the reel bottom plate 20 e and the base bottom wall 66. Finally commercialized.

[0043]

As is apparent from the above description, according to the present invention, in an electromagnetic relay in which a pair of coil terminals are arranged side by side in a direction substantially parallel to the center axis of the coil, the outer dimensions, particularly While responding to the restrictions on the width dimension,
To simplify the winding work of the electromagnet, eliminate as much as possible the risk of breakage that may occur in the extension of the conductor between the coil and each coil terminal, and respond to the demand for solder reduction in the manufacturing process. Will be possible. Therefore, there is provided an electromagnetic relay which can be manufactured inexpensively and ecologically while promoting thinning, and which has excellent operation reliability.

Further, according to the present invention, in an electromagnetic relay in which a yoke connected to an electromagnet is press-fitted to a base, the yoke can be formed without reducing the cross-sectional area of the yoke constituting the magnetic path. It is possible to securely fix to the base.
Therefore, an electromagnetic relay that can ensure stable operation characteristics and high structural reliability is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electromagnetic relay according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the electromagnetic relay of FIG. 1 from another direction.

FIG. 3 is a perspective view of an electromagnet in the electromagnetic relay of FIG.

FIG. 4 is a perspective view of a bobbin of the electromagnet of FIG. 3;

FIG. 5 is a perspective view showing the bobbin of FIG. 4 from another direction.

FIG. 6 is a perspective view showing a state where a yoke is attached to the electromagnet of FIG. 3;

FIG. 7 is a perspective view of a base and a contact in the electromagnetic relay of FIG. 1;

8 is a perspective view of a pair of coil terminals in the electromagnetic relay of FIG.

9 is a cross-sectional view schematically showing a fixed form of the coil terminal of FIG. 8;

FIG. 10 is an elevation view of the electromagnet of FIG. 3;

11 is a drawing of a yoke in the electromagnetic relay of FIG. 1,
(A) is a perspective view seen from below, and (b) is a perspective view seen from above.

FIG. 12 is an elevation view of the electromagnetic relay of FIG. 1;

[Description of Signs] 12 base 14 electromagnet 16 armature 18 contact part 20 winding frame 22 coil 24 iron core 26, 28 coil terminal 26a, 28a terminal 26b, 28b wire end fixing part 26c , 28c: fixing portion 30: conducting wire 32: yoke 62: projection 72: ridge

Claims (4)

[Claims] A coil supported by the bobbin; and a pair of coil terminals mounted on the bobbin and connected to both ends of a conductor forming the coil. In an electromagnetic relay in which terminals are arranged side by side in a direction substantially parallel to a center axis of the coil, each of the pair of coil terminals extends in a direction intersecting the center axis of the coil and extends from the winding form. A terminal portion that protrudes outward, and a wire end fixing portion that extends in a direction intersecting the terminal portion and projects substantially axially outward from the winding frame with respect to the coil, to which each wire end of the conductive wire is fixed. And an electromagnetic relay. 2. Each of the pair of coil terminals includes a fixing portion extending between the terminal portion and the wire end fixing portion, and the fixing portion is closely surrounded by the material of the bobbin by an insert molding process. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is integrally fixed. 3. An iron core received by the bobbin along the central axis of the coil, a yoke connected to the iron core and forming a magnetic path around the coil, and The electromagnetic relay according to claim 1 or 2, further comprising a base supporting the iron core, wherein the yoke has a protrusion fixed to the base by press-fitting. 4. A coil supported by a bobbin, an iron core received by the bobbin along a central axis of the coil, and a yoke connected to the core to form a magnetic path around the coil. And a base that supports the iron core via the yoke, wherein the yoke has a protrusion that is press-fitted to the base.